C.S. Osborne 149 Arch Punch 3-1/2 Inch
- Pin Hole Diameter: 3.5 inches
- Material Type: Carbon Steel
- Operation Mode: Manual
- Item Weight: 3 pounds
Last refreshed Jun 22, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A large diameter Osborne punch with a fully tempered edge and a taper built to clear the cut disc, aimed at buyers who already need a 3 1/2 inch hole.
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ASIN: B002M3DA6OModel: 149Category: Arch Punches
Overview
Osborne's 149-3-1/2 cuts a 3 1/2 inch round hole through leather, with a tempered edge and an inside taper aimed at clearing the punched-out disc rather than jamming it. It is one of the larger sizes in the 149 punch line.
Osborne forges its arch punches from a single piece of steel only up to 2 1/4 inches diameter; above that, including this 3 1/2 inch size, the barrel is welded from two pieces instead. The barrel is polished and the handle finished in black enamel, and the cutting edge is tempered all the way through rather than hardened only at the tip.
- 3 1/2 inch cutting diameter
- Cutting edge tempered through
- Inside taper for clearing punchings
- Polished barrel with black enamel handle
Who it's for
Leatherworkers and tradespeople cutting large holes for wide straps, harness fittings or grommets. Anyone whose work only ever needs small holes is better served by one of Osborne's one piece forged sizes under 2 1/4 inches.
Pros and cons
- Cutting edge tempered through, not just surface hardened
- Inside taper meant to clear the punched disc
- Polished barrel and enameled handle
- Two piece welded barrel, not a single forging
- Cuts one fixed diameter only
Performance notes
The inside taper is the working detail: as the barrel drives through the material, it widens slightly so the punched out disc slides free instead of packing the barrel. Because this size sits above the 2 1/4 inch forging cutoff, the barrel is welded from two pieces, and the cutting edge is tempered through its full depth so it keeps an edge as it wears rather than dulling at a shallow hardened layer.
Specifications
| Brand | C.S. Osborne |
|---|---|
| Model | 149 |
| Dimensions & fit | |
| Pin Hole Diameter | 3.5 inches |
| Item Weight | 3 pounds |
| Construction & materials | |
| Material Type | Carbon Steel |
| Color | Black |
| Other details | |
| Operation Mode | Manual |
| Part Number | 149-3-1/2 |
Frequently asked questions
Is the Osborne 149-3-1/2 forged in one piece?
No. Osborne forges its arch punches in one piece only up to 2 1/4 inches diameter; this 3 1/2 inch size uses a two piece welded barrel.
What does the inside taper do?
It widens slightly through the barrel so the disc of material cut out by the punch clears through instead of jamming.
Is the cutting edge hardened only at the tip?
No, the edge is tempered all the way through rather than case hardened just at the surface.